#
#    Copyright (C) 2016 Francisco Javier Parra <franparpe@openmailbox.org>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#

def checkContinuity(listOfIniEnd, tolerance):
    """Returns true if a list of list with
    the initial and last value of a functions
    are almost the same
    """
    isContinuum = True
    i = 1
    first = listOfIniEnd[0][0]
    last = listOfIniEnd[-1][1]
    while (i < len(listOfIniEnd)) and isContinuum:
        if ((listOfIniEnd[i][0] > (listOfIniEnd[i-1][1] + tolerance)) or
            (listOfIniEnd[i][0] < (listOfIniEnd[i-1][1] -
                                   tolerance))):
            isContinuum = False
        i += 1

    if ((first > (last + tolerance)) or (first < (last - tolerance))):
        isContinuum = False

    return isContinuum
